Magnetoelastic excitations in spin-Peierls systems
نویسندگان
چکیده
منابع مشابه
Singlet-triplet excitations in the unconventional spin-Peierls TiOBr compound.
We have performed time-of-flight neutron scattering measurements on powder samples of the unconventional spin-Peierls compound TiOBr using the fine-resolution Fermi chopper spectrometer (SEQUOIA) at the Spallation Neutron Source at Oak Ridge National Laboratory. These measurements reveal two branches of magnetic excitations within the commensurate and incommensurate spin-Peierls phases, which w...
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The microscopic description of spin-Peierls substances is discussed. Particular attention is paid to the ordered (dimerised and incommensurably modulated) phases. Important points are the adiabatic and the antiadiabatic approach, generic soliton forms, elastic and magnetic interchain couplings. The wealth and the accuracy of experimental information collected for the first inorganic spin-Peierl...
متن کاملModulated Phases in Spin-Peierls Systems
The discovery of the first inorganic spin-Peierls substance CuGeO3 by Hase et al. [1] renewed the interest in the phases of spin-Peierls substances (for reviews, see [2]). The constituting element of these substances are quasi one-dimensional spin chains coupled to the lattice degrees of freedom. The incommensurably modulated (I) phase is particularly interesting since this phase is the most co...
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We study theoretically the magnetic structure in the incommensurate phase of spin-Peierls systems under high magnetic fields, utilizing the analytic soliton lattice solution of the mean-field Pytte Hamiltonian. The temperature and field dependence of the magnetic components of the modulated magnetizaton and staggered spin configuration are calculated.
متن کاملPhase diagram of doped spin-Peierls systems
The phase diagram of a model describing doped CuGeO3 is derived. The model emphasizes the role of local moments released by the impurities and randomly distributed inside the gaped singlet background. The phase diagram is investigated by two methods: (i) in a mean field treatment of the interchain coupling and (ii) in a real space decimation procedure in a two dimensional model of randomly dist...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2001
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.63.174417